The Rule of 72 is an estimate of how long it would take to double a sum of money at a given interest rate.

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The Rule of 72 is a widely used mathematical formula for estimating the time it will take for an investment to double in value at a given interest rate. It is based on the concept of compound interest and assumes a constant rate of return. The formula states that the number of years it takes to double an investment is approximately equal to 72 divided by the interest rate. For example, if an investment is earning an annual interest rate of 8%, it will take approximately 9 years for the investment to double in value (72 divided by 8 equals 9).

The Rule of 72 Is an Estimate of How Long